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v3 <br /> 4DSequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corn-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-7(P312285-15)Water Sampled 12/10/03 05 52 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 5 0 iig/l 5 3120702 12/24/03 12/24/03 EPA 82606 <br /> Benzene 3 0 25 <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 50 ^ ^ ^ ^ <br /> 1,2-Dichloroethane 160 25 <br /> Ethanol ND 500 <br /> Ethylbertzene ND 25 " ^ <br /> Ethyl tert-butyl ether ND 5 0 <br /> Methyl tert-butyl ether 91 25 <br /> Toluene ND 25 <br /> Xylenes(total) 48 25 <br /> Surrogate Dibromofluoromethane 107% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 112% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 <br /> urrogate 4-Bromofluorobenzene 105% 84-119 <br /> VW-8(P312285-16)Water Sampled 12/10/03 03 32 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3120702 12/24/03 12/24/03 EPA 82609 <br /> Benzene 11 050 " 11 ^ +. " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " ^ <br /> 1,2-Dichloroethane 19 050 " ^ <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 49 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 110% 84-122 " » <br /> Surrogate 1,2-Dtchloroethane-d4 108% 74-135 <br /> Surrogate Toluene-d8 100% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> bases This analytical report must he reproduced in its entirety <br /> Page 17 of 35 <br />